SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c5ab209d14d77b7c2fca3b8217a9595db14fc3334dca514e165fe01bdce665f' 
  AND token = 'yNXPrTuKObIbaIKQXhxObkH2wbzM6k/mmrFJMg3F9ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}